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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d24e8f8abfa7f63df45b319966e0875a29a1394703f90dd0678f2efe424cd8c' 
  AND token = 'dFFj4nmxErSi0xo6g3VQLniwyykxdqyYssR7KR5W1WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}